Question: Consider the an empty stack S. Perform the following operations on this empty stack: s.push(4); s.push(10); s.push(15); s.pop(); s.push(20); After these operation, The the operation

Consider the an empty stack S. Perform the following operations on this empty stack:

s.push(4);

s.push(10);

s.push(15);

s.pop();

s.push(20);

After these operation, The the operation s.peek() shows

a) 15

b) 4

c) 10

d) 20

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